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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215f0624059132d82e9594db3e5671b9c6ddb3ac463e57c3b32109a6dee9dbd3' 
  AND token = 'cK4gDiJk8Qt0wAXI6GVGiQGIPsQhXm0gI36hYSn/Wj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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