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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875bd8d5afc2acb089559b47c41c662c2718267e88b0b7180402f55e119fe6df' 
  AND token = 'rLy8KbSKo+aH5LFpcI18NVD4NGprd5vV8idK2naG3DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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