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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf19c714fc2ec1d513bdc2fc75b5d9e11e056b41b8fd9c53a518af188d831b2' 
  AND token = 'zRfIUi1pTLj0LuCJFU8QJCBjAwIF/9hutvJWA299w+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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