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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef243a7959fd7661ed9ff5945a2a267881d9bb4c558a9d90c8c7233d99c207c0' 
  AND token = 'NpIaUDI049dPoHUrGKZ1xTWyJi2CoCd2WEbE3GqSPwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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