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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f900d12c022f9d24d5b2c5be60259f774bad5b697b8f9e5af04ec3fd8443a8e8' 
  AND token = 'Ckl+VOve5ojfvlaOt6QkMlncAGIbBDjtky/ISMphEy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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