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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce41b8528368d93633fea68664273acdd0c65432daf9a63b0dd0b35248c8a524' 
  AND token = 'eN0GxvsbDhgCDfHFKMZ5QGzHDbOgqooLLo+iElTOhMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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