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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4776dc504c008d48c73175912c3172b9931e54d32656f238f8ec38dcf6dd3490' 
  AND token = 'oavm6tOpuqzjO2oQ/ehqkHyj6s8xNclpJSX8EmQOsDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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