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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '488f87dd5b9534d1d7eaae2d28a235a3a176ce81846b79721abf007dc6201395' 
  AND token = 'Gw7EdRjVuu1acSm6khFkekl994YHCs2ZhCSSLm3ZA/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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