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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d43328b5f402bdd3cd994f3465415052fe3c0eeacc706f8d339e889fc46d2a6' 
  AND token = 'RjXO46fMG3yl5+NlFNSmHvDo0xVK5HTJI8BLXQsSjk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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