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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a63dbecd05b07a71288ad6430711cfab14d23a89f8e1b49b412f22ef2aaed9' 
  AND token = 'lfW8jP+0Hj1jJn+1axToVo3X311TtjLi9seP07lhWzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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