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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ecff2a8411d298881b0f5b219b44c1bf5b84208ef85dcb69c4e4903efddfd6' 
  AND token = 'WDLp4Nbn7qzGBXLHtZMjxuiKo3uv2G3vis9tZoucINs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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