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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac43367a50054cf13042b86aa09595032dfc9ae800c1c7b43099e0d2eaa1a28' 
  AND token = 'bElzyX2YlrDLkEXo6TO+RM/xkekmE2ChpybPUpsE+pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}