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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31556aee6a1dd8ae0042cda30c5e3e8a9ca4afb63a66046812c464887a4addb7' 
  AND token = '6mp5R0pyHrJp0H/q+Il/7i6hG24f9e4HyV8OvfXw0R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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