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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613b4738110a5605f10040f5f8e634cc8503e6e6eb72fa73566557b0558a8786' 
  AND token = 'XUffmq0vRjmfIhIGxJCk7400RW4tVccqqlNZ6HilODA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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