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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e6d04eae8f8441d373e640fb8c55aced4778125e6eccb78b4c9ad9148655d7' 
  AND token = 'wjamv3wgj2KNGVvd6dhDsCsTb6Xm3Ro2wfgIfXmuFY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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