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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41fd63a84ea514121c944fd7b06e380ed546bbe712a6f64963c86844e1c5961e' 
  AND token = '5P6Iiweo6lB6M8wgdGitapJ7T6D8HBLKUTsbWQgM0MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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