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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f23f639ff169067c7fd76dd5149b3844f0c2a690dfca386be0c41c4b6053c0' 
  AND token = 'pXTwZ9RafOkmTcQuXrUOGm9B4i3MtGOV4IycZ7K4qis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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