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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd113a047cacb2511e7d937c9f2e504714213f5de36a65f76e4ff3faca8d6d279' 
  AND token = 'QEw3supKgvnu3TampAcNT+Ew2RqFK3FEoccJfCHZXr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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