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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66896f8583fbb8c11f759a1168dcad6c87cc9c00a3ac262827a64a2a2e188fb' 
  AND token = 'cT88MxevANtRY3Ursla8NLXmMgCea+Kq7gLbQCCV7sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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