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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a9c9c9fbc2fd755e6e0b6967a4aa17553bd5cd1da369d39b971eba3e4c1054' 
  AND token = 'jcalw8vSTJO+sqgYkBQqeH3nnVHrMD3qk+s99XgomXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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