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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5956a65ba26c77cc1f750283bd934d605234101f0db44a52a9bd515ce431f334' 
  AND token = '4s5eylWO3Qp4LZDVc5ZFbseQ9AtGyUo0dXVoHHo2r10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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