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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6fa5c03b83c6aa2e65d487f5b1d6f2bf9baa6650f70b46836c275f226d13cd' 
  AND token = 'xdUpljY3pMdGuoV1G28xcAzaXPcBhjzDV8WnjFh9r6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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