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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939e43f6d1ad49e94af993c482129bed4ea505bf10adf815812dcda5bf01fb1e' 
  AND token = 'hPmk7y+7vVTGRfGhbL5TUWpfe+o5myVhkj6Ibh+ffbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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