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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ff62ff94b965bd5efd94720c8ed48a17bf723b7e285648e71100ac7532aa0b' 
  AND token = 'ERiUI0pfIWkzSv0CMatLOBy8FzwkJ47G9nZMlEXqGAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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