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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee43ae86c4c81f833fe25229ec399bba90f8a8fc0873f564dced7f5d2d0bed0' 
  AND token = 'Bp/ATT9w/+kHKz6/wffegU5YdFfaKBg3aOXaeer2aZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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