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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72cbd5592e4e57c34d1c9385730e8f24e94f8b6fffd9c0f86e58c289e4b8898' 
  AND token = 'N2GwW5twww1hNsPIH5QnYOabRJcEqRqlN/wdxPfM4HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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