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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c731ac30dea175cd4574a01064cfe201e93e1c00239d74ddd572c912d635695c' 
  AND token = 'N8jGeIYr2d+SWVXGlV14ZPgNyEShE5ecpJUuVCVmbkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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