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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f21abc1e6eebee8e0b152af12ee0eda7c8d588de5d93005a7c40efd684e35bda' 
  AND token = 'CZIo5Mnx6iVHpC7lbEspKcHyo/e8K86gbCstO1tHHK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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