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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d474294e4a9a3f053133242c164b7b793d33db8f805fade18dd044fa268320' 
  AND token = 'f81e4ULhFZ5zNiTWegZX3RPB7ftSYseMp0W9heNRiU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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