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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a90dcf4c08b5187ac69ca65f84fad6639831d7482d02aca58f1ab41f3a04fa' 
  AND token = 'KQYqZdcTyW+PHs7GQ1P3GX7vy0Jt1npRXk5wQQ0yB6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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