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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9611337ff845d92c9c79d14a2ee38b8f9ec9aaf2aa14effb1c8668f8b56e35d' 
  AND token = 'VYdH1yTywh2vmDf6GrMzDJRM974l3Io0KrXy+VEOEm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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