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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a68126225adada3dfb55b20bea96e8524f4fb848f5f4d9ea4246f7eea3d4e9e' 
  AND token = 'qZJw2tu0OKJcVq+2R1jawf7bROd3nlKGu/9SEETs7sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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