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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca2c71c742994c7a571dfb1e6645a70344a0f6317cf67c923a44e31c2d30a5b' 
  AND token = 'MnrKIJ7ZH1ZkpsqyWfoXeHSGLujJo0JKR/+g9recIug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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