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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd321aa44da38220de6f4e31797fa1ea0320d3114e28f2e71a7a4c32c1bab3f' 
  AND token = 'FcuScfUl0NoyepzrZABX8R6jsiIAweF+vAjxRki52HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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