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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69b65866775676a3497deb16876615d20be182c3ae2ff877c7015ec5cdcff60' 
  AND token = '7L7Qv8EaV0opUIJ8v9NRYxDnlGnyk84DAnChXfkvR80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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