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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7d5b8d7de6e38d5b2f012b2eb9c997996fd6269b40cd9f373c1ceb7939f85b' 
  AND token = 'MfMDQKJJDthQSYMdNesZ1zbQrXMNKMQoMy4Z0Hapw4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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