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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bb8b573890150839784edf0aa95455a0b9b1139278c351af7af9d7aaf2f0c5' 
  AND token = 'sJuE4wpBwjW1/g7rt+5HybXg18P+llCSF3D3RMGt/Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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