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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d6069e786fc26742b4331d3599da9ccf5910c07ca0a9c66db5b36f7c02d78f' 
  AND token = 'lcdT7AZT+CuGe0A9eAXkTRrplszdcdo4Og6y+D5wu0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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