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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7ca60d1a2320a71f8d82db7125aec7ed6ce4b1b5ce18f6f711bec3af42498f' 
  AND token = 'DicZ2NumgfB7XJdfA2QD5KCCpXIkVwejXtWp/0/QA1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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