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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1b59ea6a2da5e59534818997aeb5a53f075527e8e9f6ae0cdc3bdac257cbf3' 
  AND token = 'zPAkODwsQk3Tjn2AZ3DxNguFjmakxIk2ksxyFezH1H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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