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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8428c2d8e98479391717551111c94334cf8903d64baa6075b28b91ad0cdb254' 
  AND token = 'sk4bJnI4XfyWb72yDxEu7FbYuciMGyqNJEvWljHadgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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