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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9488aa1d63db50723ffcbaa7c30a036633dbe4d5d517ab1329575cda20f82a4d' 
  AND token = 'RvnN5cEWHmlic3es0ukZnSIufKv0qT6QvAUhcibCdtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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