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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c00ae5a8f602aaf25c049e888d4d65a6597c53286a1cff5044fd3bf2a1c89d4' 
  AND token = 'n7apXYDDRspdZIt8TR+4hwGUwu8fCHn0N48phNOzaeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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