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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af8dd85ab4dd29647b2fa9ad3ce61f32a2256a6b244473747ec727204f46a47' 
  AND token = '3U/yuhxzRqmCXcXIdplljS824BExNU+HKBAMsfTU/tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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