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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55f6fee32d8c0fea7d26e1f684e8bdf9695c5f1f12a1b9d39d85623ea721777' 
  AND token = 'kMCnT5MAZTncXhaqmclt9UwuxlckoGaek5dHOhhCjVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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