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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66e290b716e890d81669619dd9af9a5ccc9f45e147f07336402dec6348152be8' 
  AND token = '/SmMFZ4VuivNk4f4KQR2H1S0HHssrB6yG91q1PaGhdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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