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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45b68111502cb9497f415d961c6fc5694fb3ae9cf9960150e0e3b0b8ced5de56' 
  AND token = 'xke2Dj/2W5R20J6dWSa/lowHzp42QKfRa79HQw0g0vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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