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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01efb5965375f823124968ba8d49baddfdb79508466dd531b4149f06926803ee' 
  AND token = 'a/WUvsmriO9lSS995x3jkbPIlOEVwMy0Sy7MpG996fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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