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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bebb70c694b4368505a489974ac5f3a1b97be3ea5b046fd9e9df1e6b488fca6' 
  AND token = 'FiVxN4FsJAdnXQcTiNv+KL8NBI2Ct2jwX4xDcM+1+rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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