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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e424b1cf7181e4012371e6b3515756cb4e42efa290f09ac4efa969b7fdd478e9' 
  AND token = 'NyRTKmAhXxbBmEwdyN91liB/+wEb4Ug/ALo14ZlAubk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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