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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbb7f1907b92d0df6bf8d9aceb83909a8aedc0bb33acc47e8e053705514e20e' 
  AND token = 'JDhrKXRYrAjUsd6h8/0bePXuXlgvKgE2AmBj49Gd7KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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