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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca13a2611146ef7c6bf7828cef0d8bbb4bfe8f84431d511b87a8ba6eda51923a' 
  AND token = 'XLESa7lRPJ7l3M/XxxYHzZkPOqSilOEO5/+L0apszsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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