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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97151a6add00d38ce8987a1acd40ffb2d7fa5fe2655614ce5f5dbabd09e87f05' 
  AND token = 'G8SanYYeDHtqElJOrPtG2rFMRsGK3CA8LVF0y1H79co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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