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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff70ebb74766f1e8e2b3b167fc927d19dbc4e5ef62a0d9b36cd70cf0b39b104' 
  AND token = '8N4E1t8nhZwAXI6qLg12ZIlonci06if9+M9jZAXeG8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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