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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36aa4e58bde63f7a2ddeaa370e061b61477acbb3b4cc92b8cc164531e71786b9' 
  AND token = 'xglRA5CmvF85bVhscAdIw2e9JS/OnZ1d7Lcmfp8aEL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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