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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88130fa127aabf4072c4901ac45668fb464e81972d41a22bcae274ff32d0af27' 
  AND token = 'mH0lRZ0Kh/BfD9a/k8WTEn6HHtq92+DBqeVlk+vkdKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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