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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3f443358d0c8edbbaee26d2c85c2c655ba8de3c0419f30befc2206942d90ca' 
  AND token = '1w9+JlzftvyKLrbl5MMIcTjy0nAYjgaSOIaaNUkRrlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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