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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a99843bece5f65879725306cc0471040feda9216ecd3efaaf8c70a32734739d' 
  AND token = 'aNKxjWVyPOqV00vH6qFEhSg3duc/Q5uk5MfhSNh9Zuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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