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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790856fd2d41018260c4995faff23ae34b4c1ec747355bdfd8ac82e6591a70f9' 
  AND token = 'r8GWQ08CEw5FMl1WER6LpaY6te1sUF4zviq4AUZx2yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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