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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633e8f684a096f11a9c5f050f60ad66ccf9f8e615cc8e70fbd1f6373275436bd' 
  AND token = '/eB6g/I9YOj0OotBS5u2FDF1Yc6ci64O+YxFPO6zcl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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