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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2cfb733e8cded51d47734aea5e24180510df4e0ce9b95ec5ee667003bcddba' 
  AND token = 'jYhKYRh7A8hfB8MHCT87HsjbYNcPPhI/aWWHT0XRgGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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