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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fac79282d16fdfff0a3da23da055ef920a04fd49feb011bd26b765fc3d0564e' 
  AND token = 'J5hOIeki9xuDtwuBc/+oWBScP/6KEjYIHes22NzK8Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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