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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1aa9f13a12b93177d0824b025a5fcd7e85de77f891a309ae32531cd605f76b' 
  AND token = 'Co9EJBxg2w41wP2UqXfiqdCjYAlJCisXOYpzeZypW08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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