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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5e9e353939dd27d179796a2f44a69936eb1ae311e7536cb4965e561d7ed727' 
  AND token = 'roj/xslh3Ndt4HCCPDGIVWuCc+2HvFoDPKoVVLkQoZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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